[[folder:Marty [=McFly=]]]

[[caption-width-right:300:''This is heavy!'']]
->'''Played By:''' Creator/MichaelJFox

* ActionSurvivor
* {{Adorkable}}: Not on his father's levels, but he still has his moments. Like in ''Part III'' when he realizes that he's alone with a gun, and decides to start pointing it to his reflection and mimics Robert De Niro and Clint Eastwood. All while he's wearing pajamas.
* {{Badass}}: Particularly the way he handles 1955 Biff Tannen.
* BerserkButton: "Nobody calls me chicken!" This ends up getting him into an accident the day he returns from 1885. (May also qualify as a NoodleIncident, since it didn't appear in the first movie. Though that may just be a coincidence.)
** He also hates it when his friends or family are being abused. ''Especially'' by Biff.
* BewareTheNiceOnes: He's very sweet and friendly, but he still has a hell of a right hook and won't hesitate to use it.
* BigBrotherInstinct: He forms one over his own father in 1955, protecting him whenever he needs help. [[spoiler: Thanks to that and CharacterDevelopment on George's part, the latter becomes a better person.]]
* BookDumb: Seems to actually need the exposition Doc gives... but [[spoiler: it seems to have been him that hooked that 1985 video recorder up to Doc's 1955 TV. Maybe Doc's been teaching him?]]
* BuffySpeak
-->'''Marty:''' (looking at a bathysphere) It's some kind of... deep-sea diving thingy.
* BullyHunter: Granted, since he's grown up seeing Biff as his father's tormentor, it's not too big a surprise.
* ButtMonkey: At times.
* TheCallKnowsWhereYouLive
* CatchPhrase:
** "Nobody calls me chicken!" Cue TropeNamer.
** "This is heavy!"
** "Holy SHIT!"
** ''(every time he tries to distract his enemies)'' "Hey, [[LookBehindYou what the hell is that]]?!" or "Hey, what's that?!"
** "Here goes nothing." (In the video game)
** He also tends to mutter [[SarcasmMode "perfect..."]] when things aren't going well for him.
** [[LetMeGetThisStraight "Wait a minute..."]]
* CharacterDevelopment: His self-confidence seems to have improved after the events of ''Part I''.
** In ''Part III'', Marty finally overcomes his FatalFlaw[=/=]BerserkButton, [[spoiler:saving himself from getting killed by Buford Tannen]] and [[spoiler:saving himself from becoming a FutureLoser by never agreeing to the street race with Needles]].
* CharacterTics: His, erm... ''unusual'' sleeping position.
* ChekhovsSkill: Skateboarding, guitar shredding, and (later) arcade shooters.
* CombatPragmatist: Kind of necessary when facing guns and men twice your size (sometimes both at once).
* CompressedVice: Again, his dislike of being called a chicken. In the second movie, his parents reflect on how this was always his FatalFlaw. Would be normal if it weren't for the fact that he isn't shown to have this trait in the first movie; he has a quick temper and some {{Determinator}} aspects, but no one calls him out on anything directly.
** [[FridgeBrilliance Although the fact that he takes a sip from the liquor after Lorraine tells him he's being a square might be a subtle sign of it.]]
* CoolBoard: Apparently to make up for the fact that he doesn't have a car, originally; we never see him doing any tricks on it.
* CoolLoser: Supposedly. The only person we see treating him this way in the original timeline is Strickland, though.
* CrueltyIsTheOnlyOption: In the game, [[spoiler: to save the future, Marty pretty much obliterates Emmett's life in the span of two minutes.]]
* DeadpanSnarker: At times.
* {{Determinator}}: Particularly in ''Part II'', and especially during his second time in 1955. Dude just will not quit in trying to get the Almanac back.
* DorkKnight
* FatalFlaw: Again, see BerserkButton.
* {{Fanservice}}: A split-second shot of him in purple Calvin Klein underwear. Plus in the third movie you get a nice shot of his butt.
* FishOutOfTemporalWater: Takes an ''unusually'' long time to get fully acclimated to being in 1955. [[FridgeBrilliance Perhaps because his father wasn't a novelist in his original upbringing?]]
* {{Flanderization}}: Into TheDitz in ''WesternAnimation/BackToTheFuture TheAnimatedSeries''.
* [[FourTemperamentEnsemble Five-Temperament Ensemble]]: Sangune/Choleric
* FutureLoser: ''Part II'' reveals that Future Marty gave up guitaring and ended up a lowly {{salaryman}}, stuck working for his high school enemy ([[TurnOutLikeHisFather la George]]). [[spoiler:Luckily in ''Part III'', Marty manages to avert the event that led to this timeline, with the implication that he has a better future.]]
** FutureBadass: If the [[spoiler:ending to the Telltale game can be trusted]].
* GuileHero: He uses his wits as much as his physical ability to solve his problems.
* TheGunslinger: Thanks to [[http://en.wikipedia.org/wiki/Wild_Gunman an arcade light gun game]], he is an accomplished QuickDraw artist. Though, he does refuse to kill Buford so as not to mess up the timeline.
* HairTriggerTemper: Lampshaded by being called a "hothead" by many throughout the trilogy. This is especially true if you call him a chicken, which will make hell break loose and he'll try to punch you out.
* HardHead
* TheHero
* HiddenDepths: He's a lot smarter than he seems.
* HighSchoolHustler: [[DownplayedTrope Downplayed]]. He's not really a trickster as usually seen in this trope, but he's no less lucky and helpful. Played straighter in the early drafts for the movie, however.
* HypocriticalHumor: In the first movie, Marty takes away Lorraine's liquor bottle, saying that she may regret it later in life. He then immediately starts to drink from it himself, but spits it out when Lorraine starts to smoke.
* IKnowMortalKombat: Learned how to sharpshoot from playing an arcade game.
* IndyPloy: He's quick at coming up with ways to get himself out of a bind.
* INeedAFreakingDrink: He seems to have this reaction to "parking" with his [[ParentalIncest future mother]] - [[HypocriticalHumor right after he takes the liquor bottle off of her]], he takes a swig of it himself (leading to the SpitTake described below).
* InnocentBlueEyes: Not really innocent, per se - but his big blue eyes do give off the vibe of "Flabbergasted-[[FishOutOfTemporalWater Fish-Out-Of-Temporal-Water]]".
* KidFromTheFuture: In ''Part I''. Technically a "Great-Great-Grandkid from the Future" in ''Part III''.
* LookBehindYou: Not only does Marty love this, but it almost always works!
* LoserSonOfLoserDad: In the first film, Strickland sneers that Marty comes from a long line of SLACKERS. (Which is unfair, as he's clearly more outgoing than George ever was in the original timeline.)
* LoveAtFirstSight: Says that this happened with him and Jennifer when Doc scoffs at the idea.
* NameMcAdjective
* NiceGuy
* NiceJobBreakingItHero: In ''Part II'', its his plan to use the almanac that older Biff overhears and goes back in time to tell his 50's self. Leading into the conflict for the rest of the film.
** In the game, [[spoiler:he messes up the timeline so much that he prevents the events of the movies from ever happening. Creating the Alt!1986 Citizen Brown timeline.]]
* NobodyCallsMeChicken: In one timeline, this flaw ruined his life.
* OnlyKnownByTheirNickname[=/=]InSeriesNickname: His actual name is Martin, but everyone calls him Marty.
* OnlySaneMan
* PintsizedPowerhouse: He's only 5'4" but is able to knock out 6'3" Biff and Buford with a few punches.
* PlayingCyrano
* {{Pride}}: The proper name for his FatalFlaw. He feels he can't back down from a challenge when called "Chicken", but as the series goes on this turns out to have serious [[spoiler: and by part III, near fatal]] consequences. [[spoiler: Eventually he learns to overcome it after some sound advice from his ancestors. Which inadvertently saves his future in the process.]]
* RedOniBlueOni: The Red Oni to the Blue Onis of Doc and George.
* RidiculouslyAverageGuy: For a skateboarding rockstar wannabe, he's surprisingly down to earth.
* ScarsAreForever: In the game, [[spoiler:when trying to prove to his parents that he really is their son in an alternate timeline [[note]](as the Marty in ''that'' timeline has been run out of town)[[/note]]]] it's revealed that he has a scar on his left knee that he got in a skateboarding accident when he was twelve.
* SpitTake: After confiscating Lorraine's liquor bottle, he sees her lighting a cigarette - [[HypocriticalHumor just as he takes a swig...]]
** A RealLife example happened in a [[http://youtu.be/dR_wNXvcZ9g?t=2m9s blooper]] of the same scene - as a prank, the prop bottle was replaced with an identical one with real alcohol in it, causing Michael J. Fox to spray it all over himself and [[CrowningMomentOfFunny hilarity to ensue]].
* SupportingProtagonist: WordOfGod views him as this in the first and third movies, with George and Lorraine getting the most development in Part I, and Doc getting it in Part III.
* ThisIsWrongOnSoManyLevels: Marty often reacts like this when stuff happens with his young mother [[spoiler: and grandmother too in the game, for different reasons.]]
* TragicHero: Narrowly subverted; his FatalFlaw nearly causes him to [[spoiler: break his hand and ruin his rock star dreams in a race with Needles]] or [[spoiler: get shot by Buford]], [[spoiler: but he learns to overcome those flaws and therefore doesn't fall into tragedy.]]
* TrueCompanions: To Doc. In the movies, yes. But it's especially flagrant after the game.
* TheWatson: Neither unskilled nor unintelligent, but can't hold a candle to Doc.
* WhatTheHellHero: Gets called out on by Doc for trying to bring back a Sports Almanac listing all the winners from 1950-2000 in the sequel so he can win money and become a billionaire.
* YoungGun: Subversion in ''Part III''.

[[folder:Emmett Lathrop "Doc" Brown]]
[[caption-width-right:300:''GREAT SCOTT!'']]
->'''Played By:''' Creator/ChristopherLloyd

* AbsentMindedProfessor
* {{Adorkable}}: Especially in Part III, when he sees Clara at the dance.
* AgeLift / DawsonCasting: Christopher Lloyd was only 48 when he filmed the role for the 71 year old Doc Brown. Probably done on purpose so when Marty goes back to 1955 and meets the 41 year old Doc Brown they look the same, except for aging make-up in 1985, which was dropped in the other parts as Doc underwent a rejuvenating process. [[TooMuchInformation They also replaced his spleen and colon.]]
* BadassLongcoat: In ''Part III''.
* BerserkButton: Two, each corresponding to an important person in his life.
** When Buford "Mad Dog" Tannen implies he's going to sexually assault Clara, Doc wrestles away from Tannen's {{Mooks}}, curses at him, and strides forward like he's about to start something.
** When Tannen shoots Marty and then laughs about it, Doc looks like he's about ready to bite his head off.
* BigGood: He has only good intentions with time-traveling, wants to set the timeline's right so no one suffers, and is genuinely helpful to Marty in all three movies and sees him as a close friend.
* BunglingInventor: Strictly speaking, the time machines are the only inventions of his that work[[note]]That we see, that is. The time machine is his only invention seen in 1985, and he seems to be a lot more bungling in 1955, but in that 30-year time period, it's possible he was a lot more accomplished[[/note]].
* BunnyEarsLawyer: He may be eccentric but he's also on par with his scientific heroes in terms of intelligence.
* CantHoldHisLiquor: All it takes is a single shot of whiskey, and he's out like a light.
* CatchPhrase: ''"Great SCOTT!!"''
* CharacterDevelopment: Goes from believing at the start of the trilogy that "no man should know too much about his destiny" to saying that "the future hasn't been written yet. No one's has. Your future is whatever you make it!" at the end.
* {{Cloudcuckoolander}}: He is famous for his quirky and eccentric personality.
* CoolOldGuy: The guy's built a TimeMachine out of a rather poor car, for starters.
* DeadpanSnarker: It's rare, but he has his moments.
-->''Marty points out his father, who has a "kick me" sign on his back
-->'''Doc:''' Maybe you were adopted?
* {{Deuteragonist}}: Although, Doc is arguably the main character of the third film.
* EinsteinHair: How ''did'' he get his hair to stick out like that? The game expends on this. During the 1931 HV Science Expo. Young Emmett is driving his flying rocket powered car, which explodes violently. When Emmett exits the expo, his hairs became like his movie counterpart, as a result of the explosion (which he didn't have before). He comments that after that incident, he got banned from the expo for at least 50 years.
* FanOfThePast: Particularly the Old West.
* ForScience: Though he's quick to see the problems time travel might cause, and has no problem ordering Marty to destroy the time machine.
* [[FourTemperamentEnsemble Five-Temperament Ensemble]]:Sanguine
* FriendlessBackground: at the time of the films, he has only Marty and his pet dogs, because no one in Hill Valley wants to come near "crazy old man Brown."
* GadgeteerGenius
* GentlemanAdventurer
* GoingNative
* HawaiianShirtedTourist: Played with. Doc is rarely seen without a tacky luau shirt, and he ''is'' a tourist.
* HerrDoktor: Doc technically falls under this, as his father is German.
* HotBlooded: Even more so when he's 17.
* IfMyCalculationsAreCorrect: When Doc's baby hits 88 miles per hour, you're gonna see some serious shit.
* IndyPloy: More subtly than Marty, but Doc can be surprisingly pragmatic when he needs to be.
* IntergenerationalFriendship: It's a credit to the actors that we, as viewers, don't question why a skater punk and some old guy would hang out together.
** The [[AllThereInTheManual original script]] had a line by Marty explaining that Doc hired him to clean his garage. Marty, being a music aficionado, was impressed with Doc's vintage record collection. The rest is history.
** The screenwriter decided it wasn't necessary to explain how they first met. Doc is a local pariah and a weirdo, and Marty is clearly a rebel. It's inevitable that Marty would snoop around Doc's garage at some point.
** [[WordOfGod Bob Gale himself]] finally gave [[SugarWiki/HeartwarmingMoments a rather heartwarming]] explanation [[http://mentalfloss.com/article/28526/back-future-co-creator-bob-gale-explains-how-marty-and-doc-became-friends over on Mental Floss.]]
*** Another explanation could be drawn from the movie - that their friendship is a StableTimeLoop. Marty and Doc are friends because Marty helped him in the fifties (and in the game, saved him in the thirties) so Doc knew who he was in the eighties and became friends with him, thus leading to him once again do all of those things.
* LargeHam: What would you expect from Creator/ChristopherLloyd?
* LiteralMinded: This comes up a couple of times in the first movie, where he takes Marty's use of slang[[note]]"This is heavy[[/note]] at face value in 1955.
* LoveAtFirstSight: Though skeptical of it, it comes true when he meets Clara, which is reciprocated. Becomes a bit of a problem when he and Marty need to get [[TitleDrop back to the future]].
* MadScientist: Although he's well-meaning, both to Marty and humankind.
* MayDecemberRomance: Played with. Historically speaking, Clara was around 60 years older than him, but biologically speaking, Doc was about 30 years older than her when they first meet.
* MeaningfulName: His first name is "Time", pronounced backwards. His ambition is to travel in time.
* MisunderstoodLonerWithAHeartOfGold: He has the rumors of being a "crazy old man", and Marty was even warned not to go near him, but did so anyway and befriended him, according to WordOfGod. His main purpose with time-traveling is to help mankind with their problems; he refuses to alter it for personal gain, [[WhatTheHellHero which he calls out on Marty for trying to do in the sequel.]]
* OlderThanTheyLook: He's nearly one hundred years old in the game, yet still looks like a man in his sixties. [[JustifiedTrope Justified]] by the fact that he took advantage of future medicine to rejuvenate himself and increase his lifespan. [[TooMuchInformation They also replaced his spleen and colon]].
* OmnidisciplinaryScientist: Aside from inventing a time machine with an on-board nuclear reactor, he's also managed to build a working refrigerator (well, it can produce ice, anyway) using 1885 components, and a second time machine that runs solely on steam power (again, using components available around 1885). Also, when he meets Clara and lets slip that he's a scientist, he mentions that he's a student of all sciences.
* OnlyFriend: Marty.
* TheProfessor: In the original draft, he'd been called "Professor Brown" before it was recommended that he'd be called "Dr. Brown" or "Doc". This new nickname became so iconic that during the filming of ''Film/TheFrighteners'' years after BTTF, Creator/MichaelJFox kept calling the Judge character "Doc".
* TrueCompanions: To Marty. Especially after the game.
* ReluctantMadScientist
* SdrawkcabName: His first two names. His first name Emmett is "time" pronounced backwards, and his middle name Lathrop is "porhtal", as in "time portal".
* SesquipedalianLoquaciousness: Especially in the [[WesternAnimation/BackToTheFuture animated series]]. In the DVD commentary, it's lampshaded that Doc will use a bigger word when he could easily use a smaller word, such as calling a dance "A rhythmic ceremonial ritual" even though the word "dance" was clearly written.
* SophisticatedAsHell: "IfMyCalculationsAreCorrect, when this baby hits 88 miles per hour, [[PrecisionFStrike you're gonna see some serious shit."]]
* SymbolMotifClothing: He's wearing a shirt decorated with locomotive trains in ''Part II''. The same shirt becomes his bandanna in ''Part III''.
* TookALevelInBadass: His first appearance in ''Part III'' involves him rescuing Marty from being hanged by shooting the rope holding him up, then proceeds to get Buford and his goons to run off.
* TheVonTropeFamily: In ''Part III'' Doc explains that his family use to be the "Von Brauns". He goes on to explain his father changed it to Brown because of UsefulNotes/WorldWarOne.
* WordOfDante:[[invoked]] Bob Gale guesses that Doc was involved with the Manhattan project, but became an outcast and spent the remainder of his life trying to invent something beneficial for humanity. Hence the portable nuclear reactor which he sank his entire fortune into. This would also explain his cynical predictions for the future in 1955 ("Of course! Because of all the fallout from the atomic wars!")

[[folder:Lorraine Baines-[=McFly=]]]
->'''Played By:''' Lea Thompson

* BrokenBird: In 1985-A.
* FormerTeenRebel: ''Rebel'' might be pushing it a bit, but she's clearly a little rougher in 1955 than the nice girl image would have you believe.
* [[FourTemperamentEnsemble Five-Temperament Ensemble]]: Sanguine.
* GagBoobs: Biff-A made Lorraine-A get some by 1985-A; she doesn't enjoy them.
* GuessWhoImMarrying: Biff in 1985-A.
* HappilyMarried: To George. Disappointed with him in the original 1985, but clearly their relationship is in better shape after Marty 'fixes' things.
* HighSchoolSweethearts: With George.
* IWasQuiteALooker: Very much. Marty is shocked by Lorraine's real attractiveness when he meets her in 1955. She does retain much of her good looks once the timeline is altered.
-->'''Lorraine:''' My name's Lorraine, Lorraine Baines.
-->'''Marty:''' Yeah... but you're ho... you're so h... you're so... thin!
* LadyDrunk: In the original 1985. Even more so in 1985-A. [[spoiler: And in the Citizen Brown timeline in the game.]]
* MsFanservice: At least in 1955.
* NoDoubtTheYearsHaveChangedMe: The difference between the Lorraine of 1973-A and 1985-A is downright jarring.
* ParentalIncest: Has a crush on Marty in the first film - much to his horror. Becomes a major problem.
* PlayingGertrude: Lea Thompson is just nine ''days'' older than Creator/MichaelJFox. Though it does make perfect sense, as for most of the first film (intended as a one-shot story at the time) she's the same age as Marty.

[[folder:George [=McFly=]]]
->'''Played By:''' Crispin Glover, Jeffrey Weissman

* {{Adorkable}}: A nerd who is more comfortable watching or writing sci-fi than he is with social interaction and who takes notes on what to say to the girl he likes.
** As he introduces himself to Lorraine as her "density", she seems amused by it. This probably would've succeeded if Biff hadn't shown up.
* BerserkButton: When Biff pushes Lorraine to the ground, it prompts George to react with violence for probably the first time in his entire life.
* ChivalrousPervert: Earlier on in the movie, in 1955, he's spying on Lorraine through the window as she undresses (Marty: "He's a Peeping Tom!"). However, his fire is lit if you try to touch Lorraine inappropriately. It drove him to overcome his insecurities and stand up to the person who has bullied him his whole life by punching him out, saving Lorraine from AttemptedRape in the process. After he has saved her, he asks if she's okay, and helps her up to her feet. His chivalry is what makes him win her heart.
* EatingLunchAlone: George sits by himself at the cafeteria during lunch in 1955, writing ideas for his stories.
* ExtremeDoormat: Before [[TookALevelInBadass taking a level in Badass]].
* FakeShemp: In the sequels, especially ''Part II''.
* FlashbackWithTheOtherDarrin: It may not be particularly noticeable most of the time due to clever camera work and tech, but the shots with George in Part II that aren't stock footage are played by Jeffrey Weissman.
* [[FourTemperamentEnsemble Five-Temperament Ensemble]]: Phlegmatic
* HappilyMarried: To Lorraine.
* HollywoodNerd: To the nth degree, before time got altered.
* KickMePrank: George is the victim of a particularly cruel prank when some of Biff's friends tape a sheet of paper with the words "KICK ME" on it on his back.
* MostWritersAreWriters
* TheOtherDarrin: Since Glover refused to participate in the sequels, this was practically forced.
* ThePeepingTom: In 1955 and the Citizen Brown timeline of the game.
* PlayingGertrude: Glover is actually 3 years ''younger'' than Creator/MichaelJFox. (averted with Weissman, who is 3 years older). Justified for the same reason this trope is listed in Lorraine's list.
* TheSouthpaw: An early draft had George discover he could punch very strongly with his left hand. The final film has George's desire to protect Lorraine cause him to unleash his inner strength, but close observers might notice he knocked out Biff by punching him with his left hand.
* TookALevelInBadass: Marty basically helps him rise to this point. As soon as Lorraine is shoved to the ground, the fire is lit.
* [[YouLeaveHimAlone You Leave Her Alone:]] Said word for word by George.

[[folder:Biff Tannen]]
[[caption-width-right:349:''What are you looking at, butthead?!'']]
->'''Played By:''' Thomas F. Wilson

* ArchEnemy: To the [=McFly=] Family in general, but mostly Marty in the first movie.
* BerserkButton: He really hates manure. When Marty told him he heard about the manure incident in 1985-A he seemed more angry than confused.
* BigBad: Of Parts ''I'' and ''II''.
* BitchInSheepsClothing: The new "nicer" Biff that appears at the end of the first Back to the Future is pretty much an act given that he returns to being a massive {{Jerkass}} when he's an old man (in context, he seems ''really'' bitter about how Marty Sr. turned out). It's unknown if he's still this way in Part III, after the timeline's fixed.
** The Biff of 1985-A cultivates a philanthropist image in his rise to power.
* TheBully: Biff to George, and to Marty, and to Lorraine.
* TheCaligula: In 1985-A.
* CannotTellAJoke: Biff is constantly, err, [[IncrediblyLamePun biffing]] his attempts at wordplay with lines like "Why don't you make like a tree and get out of here"[[note]]It's "leave", you idiot! "Make like a tree, and leave!" You sound like a damn fool when you say it wrong![[/note]] and "That's as funny as a screen door on a battleship."[[note]]"Screen door on a submarine, you dork"[[/note]] Presumably everyone is too afraid of him to correct him. He is [[{{Lampshading}} berated]] for this by his [[IHatePastMe older self]] in the second movie.
* CantGetAwayWithNuthin: That's ''two'' coats of wax, Tannen!
* CatchPhrase:
** "Hello! Hello! Anybody home?! Hey, think, [=McFly=], think!"
** "Butthead"
** "Hey [=McFly=]!"
** "How about you make like a tree and get out of here?"
* CorruptCorporateExecutive: In 1985-A, as the founder of Biffco. He apparently has a head for business, as he's basically a small business owner in the 'fixed' 1985 timeline.
* {{Egopolis}}: Alternate Hill Valley is a gigantic ShrineToSelf. The front of his casino (formely the Clock Tower) is a museum dedicated to Biff's life, with a life-size wax statue and film reel describing his rapid rise to fortune.
* EvilIsPetty: Exhibit A -- Stealing a ball from some neighborhood kids and [[ThrewMyBikeOnTheRoof hurling it onto a nearby roof]]. And then he strolls away cackling to himself.
** In the alternate present, we see a headline describing George's murder; Biff, the actual gunman, crows that the police would never arrest him. The article explains that George was headed for a meeting to protest the environmental policies of Biffco.
* EvilLaugh: ''Icing on the cake.''
* FakeUltimateHero: In 1985-A, thanks to Grey's Sports Almanac.
* [[FourTemperamentEnsemble Five-Temperament Ensemble]]: Choleric
* FreudianExcuse: His [[TheUnseen grandmother]] sounds like a case.
** In the Telltale game, his father is revealed to be a notorious bootlegger.
* FutureLoser: The altered timeline had him waxing cars, most often for the [=McFly=] family, in contrast to his supervisor job in the original timeline. Seems to be aware that he's this by 2015.
* IAmNotSpock: Thomas F. Wilson actually [[http://www.youtube.com/watch?v=iwY5o2fsG7Y wrote a song about it.]]
* IHatePastMe: "It's '''LEAVE'''!! You ''idiot!'' 'Make like a tree and ''leave''.' You sound like a damned FOOL when you say it wrong!"
* InTheBlood: Descended from an outlaw, he's pretty much more of the same. No word about how his son turned out, but his grandson Griff's at least as bad as he ever was if not more. And in the game, it's revealed that his father was a notorious bootlegger.
* {{Jerkass}}: Until George stands up for himself, anyway. And he seems more bitter than jerkass in 2015 - given the opportunity to go back in time, he opts to make himself rich rather than do anything to the [=McFly=] family.
** JerkJock: 1955!Biff is a textbook example.
* {{Malaproper}}:
** In ''Part II:''
-->'''Young Biff:''' ''[to old Biff]'' Now why don't you make like a tree and get outta here.
-->'''Old Biff:''' (''[[[DopeSlap slaps young Biff]]]'') It's "LEAVE", you idiot! "Make like a tree and LEAVE". [[IHatePastMe You sound like a damned FOOL when you say it wrong!]]
** Also in ''Part II'':
-->'''Biff:''' That's about as funny as a screen door on a battleship.\\
'''Marty''': ''(hiding in Biff's car)'' That's a screen door on a ''submarine'', you '''dork'''.
** And in ''Part III'', we find out that it runs in the family:
-->'''Buford:''' I'll hunt you and shoot you down like a duck!
-->'''Buford's Henchman:''' It's "dog", Buford, "shoot him down like a dog".
* LargeHam
* MeanCharacterNiceActor: Thomas F. Wilson based Biff on his own experiences ''being'' bullied. In high school, he was more like George [=McFly=].
* MurderTheHypotenuse: [[spoiler:In 1985-A, to George [=McFly=].]]
* NoCelebritiesWereHarmed: WordOfGod says the 1985-A version of Biff was inspired by DonaldTrump. The portrait in Biff's office was even based on one of Trump.
* OlderAndWiser: 2015!Biff. He formulates a surprisingly effective plan to make his past self rich, ''after'' listening to Doc talking about the risks of meeting an alternate self, and even figures out how to make the time machine work.
* OurFounder: Has a wax statue of himself standing in 1985-A's museum.
* OutdatedOutfit: In 1985-A, he and his gang seem to fit in more with the TheSeventies than TheEighties.
* {{Retgone}}: A deleted scene from Part II shows Old Biff fading away when he returns to 2015. [[spoiler:1985-A Lorraine apparently shot him some time in the mid-90s.]]
* SchoolyardBullyAllGrownUp: In the original timeline, he's still at it, holding power over George. In 1985-A, he has power over Hill Valley, as well as California itself.
* ScrewTheRulesIHaveMoney: In 1985-A.
* VillainousBreakdown: After the second time he crashes into a manure truck. He screams about how he hates manure, and looks like he's about to ''cry''.
* VillainousCrush: For Lorraine.
* VillainWithGoodPublicity: In 1985-A, he's even got his own museum dedicated to his life story.
* WouldHitAGirl: In the first film, he pushes Lorraine to the ground, and in the alternate 1985 of part 2, he abuses her along with Marty, among other things making her get breast implants.
* YouKilledMyFather: [[spoiler: He killed George, Marty's father, in 1985-A]].

[[folder:Jennifer Parker]]
->'''Played By:''' Claudia Wells, Elisabeth Shue

* AgentMulder: At the start of the second movie, when she learns that the [=DeLorean=] is a time machine, she doesn't question it once (although she ''does'' sound pretty freaked out when she asks if they're in 2015).
* AllGirlsWantBadBoys: [[spoiler: In the alternate!1986]] in the Telltale game, [[spoiler:she's dating an ugly, stupid tool rather than Marty - just because he plays electric guitar in a band (the Marty in the alternate timeline is apparently a grade-A nerd who plays the ukulele rather than guitar). This trope is how the real Marty wins her back, along with showing off his guitar talents]].
* TheCheerleader: Averted. It's implied in ''Part II'' that she may have been a cheerleader in high school (a maroon and white school jacket can be seen in the closet she's hiding in in 2015, with the name "Jennifer" and an emblem consisting of a megaphone over the "HV" letters), but she's the GirlNextDoor type, and doesn't seem like an AlphaBitch or TheDitz as is usually seen in this trope.
** This is a possible ActorAllusion - in ''Film/TheKarateKid'', Elisabeth Shue's character, Ali, is a cheerleader.
* TheChick: You get the feeling that there's more to her, but the plot of ''Part II'' forces her into this role.
* DeadpanSnarker: In the game. [[spoiler:Well, the punk-rock delinquent version of herself, anyway.]]
* EightiesHair: Especially with her first actress.
** [[spoiler:In alternate 1986, this becomes DelinquentHair.]]
* [[FourTemperamentEnsemble Five-Temperament Ensemble]]: Phlegmatic
* FlashbackWithTheOtherDarrin: It's even the page image!
* GoodGirlGoneBad: In the game, [[spoiler:she's a [[TookALevelInJerkass bitchy]], [[DeadpanSnarker sarcastic]], delinquent rocker in the alternate-1986; this is implied to be [[LaResistance a form of rebellion]] against Citizen Brown's rule.]]
* GuestStarPartyMember: Her most significant role was in the second film. Which involved her running around her future home in a controlled panic. The Bobs have noted that if they'd intended on making a sequel, they would not have had Jennifer go to the future with Marty and Doc as they had no idea what to do with her.
* GirlNextDoor
* HighSchoolSweethearts: Is this with Marty, and we see that they're married with kids in 2015. But the original timeline isn't very happy, though maybe not to the extent of George and Lorraine in ''their'' original timeline - they appear to actually be HappilyMarried. Lorraine even says that she thinks that she married her son out of pity (and this is to her own ''granddaughter'')! [[spoiler:Fortunately, it's heavily implied that her and Marty's future becomes much better/happier after Marty prevents the incident that ruined his life from happening thanks to his CharacterDevelopment.]]
* InSeriesNickname: Is called "Jen" a couple of times by Marty in ''Part III'' and in the game.
* TheLoad: Bob Zemeckis and Bob Gale never had a character development in mind for her, stating that had they planned to make a sequel to the original film, they would not have put "the girl" in the car at the end. Sure enough, less than five minutes into ''Part II'', she's sedated and pretty much spends the rest of the series that way. Her actresses aren't even given top billing in the film credits, even though those who play even smaller roles are.
* LockedOutOfTheLoop: It's quite clear that she has absolutely NO idea what's going on when she climbs into the [=DeLorean=] with Marty. Catches up fast, though.
* LoveAtFirstSight: With Marty, according to him when explaining that the trope is possible to Doc.
* SatelliteLoveInterest: She appeared very little in the first movie and apparently existed only so that Marty would have someone to spill exposition on in the opening scenes. Robert Zemeckis and Bob Gale tried to write her out of the sequels, but the way they ended the first movie made that difficult; she did get some development in the second and third movies.
* TheOtherDarrin: From Claudia Wells, to Elisabeth Shue, and back again. The opening scene of the second film is actually a painstakingly exact recreation of the end of the first, with the actress as the only difference.
* SecretKeeper: She becomes this once Marty tells her about (and shows her whats left of) the Doc's time machine.
* StaticCharacter: Through no fault of her own, she comes off as this.

[[folder:Clara Clayton]]

->'''Played By:''' Creator/MarySteenburgen

* ActorAllusion: Mary Steenburgen had also starred as a woman who fell in love with a time-traveler in ''Film/TimeAfterTime''.
* DistressedDamsel
* [[FourTemperamentEnsemble Five-Temperament Ensemble]]: Melancholic.
* LoveInterest: To Doc Brown.
** LoveAtFirstSight: Becomes rather flustered when she first lays eyes on him after [[RescueRomance he saves her life]].
* GeekyTurnOn: "You've read Creator/JulesVerne?", "I ''adore'' Creator/JulesVerne!"
** Doc's science background also intrigued her.
* PluckyGirl: She's crazily determined enough to climb all the way to the train's engine room, despite all the explosions.
* {{Schoolmarm}}
* WomanScorned: When she believes [[CassandraTruth Doc is toying with her]], she calls him out, slaps him, and slams the door in his face.

[[folder:Vice Principal Gerald Strickland]]
->'''Played By:''' James Tolkan

* BaldOfEvil: "Jesus, didn't that guy ''ever'' have hair?" (Nope.)
* BlondGuysAreEvil: The last remnants of his hairline in '55.
* BowtiesAreCool
* {{Catchphrase}}: "Slacker!"
* DeanBitterman
* EmbarrassingOldPhoto: In the game, Marty finds an old photo of him as child -- dressed like a girl -- in Strickland's sister's apartment.
* [[FourTemperamentEnsemble Five-Temperament Ensemble]]: Choleric
* HairTodayGoneTomorrow: Averted. He's down to the last few dregs of his hair in 1955 and completely bald in 1985. Played for laughs with his grandfather who had extremely long hair.
* {{Jerkass}}
* MeaningfulName: Strickland. He's really strict.
* KnightTemplar: Particularly in the alternate 1985 created by the almanac.
-->'''"[[ShotgunsAreJustBetter EAT LEAD]], [[{{Catchphrase}} SLACKERS]]!!'''"
* TookALevelInBadass: In 1985-A. He became a shotgun-wielding survivalist because of the collapsing of civilization in Hill Valley.

[[folder:Buford "Mad Dog" Tannen]]
->'''Played By:''' Thomas F. Wilson

* BadassMustache
* BerserkButton: Calling him by his nickname "Mad Dog" has apparently been Buford's for a long time as the moment Marty says it in the Palace Saloon, [[MassOhCrap every single person in the saloon either silently runs away or makes themselves scarce]].
* ChekhovsGunman: He's first mentioned in the video playing in Biff's Museum in 1985-A.
* DisproportionateRetribution: Originally, he shoots Doc in the back over a matter of 80 dollars, involving a horse that threw a shoe (which Buford shot) and the bottle of whiskey that broke as a result. He also shot a newspaper editor who printed an unfavorable story about him in 1884, which made everyone stop keeping track of his kills.
* TheDreaded: Everybody gets apprehensive around him. So much so that the newspapers stopped keeping track of all his kills after he'd shot an editor who printed an unfavorable story about him.
* EvilHasABadSenseOfHumor: He thinks hanging Marty and later shooting him are funny.
* HairTriggerTemper: One of the reasons he's nicknamed "Mad Dog", and a major reason why everyone is scared of him.
* InTheBack: How Buford kills Doc in the original timeline. In a deleted scene, Buford does the same thing to Marshal Strickland when the marshal tries to stop him as he heads into town to duel with Marty.
* IdenticalGrandson: A bit tricky to pin down the usual features of a Tannen through that mustache, but he has 'em.
* {{Jerkass}}: Well, he's a Tannen. What else would you expect at this point?
* {{Malaproper}}: "I'll hunt you and shoot you down like a duck." "It's dog, Buford."
* MeanCharacterNiceActor: Again, he's played by Thomas F. Wilson, so Biff's character traits are seen with Buford.
* PoliticallyIncorrectVillain: "He once bragged that he'd killed 12 men, not including Indians or Chinamen."
* WouldHitAGirl: And did it to Clara, which roused Doc's ire considerably.

!The 2010 Game

[[folder:Edna Strickland]]

Sister of Gerald Strickland. A CrazyCatLady Marty meets in Episode 1. Because Marty interacts with her and young Emmett in 1931 they both fall in love, this little mistake throws the timeline into jeopardy and prevents the events of the movie from ever happening.

* AllGirlsWantBadBoys: [[spoiler: In the game finale, with Kid Tannen, of all people.]]
* BigBad: Of the game.
* CatchPhrase:
** "It's a fact, look it up."
** "Hooligans!"
* CrazyCatLady: The original 1986!Edna and [[spoiler: Crazy, Old 1931!Edna]].
* {{Cloudcuckoolander}}: By the time Episode 5 rolls around, Marty exclaims, "Jeez, that lady was always a loon!"
* EpicFail: [[spoiler: While in 1876, Edna tried to burn down Hill Valley's saloon since her grandfather wouldn't do anything about it. ...this ended up burning down ALL of Hill Valley.]]
* EvilOldFolks
%%* FromNobodyToNightmare
* GrandmaWhatMassiveHotnessYouHave: [[spoiler: She aged considerably better in the timeline where she married Emmett.]]
* [[GrumpyOldMan Grumpy Old Woman]]
%%* HeWhoFightsMonsters
* HollywoodToneDeaf: However, her song [[spoiler: is quite effective when it was sang by others.]]
* HotScoop: In 1931
* LoveRedeems: [[spoiler: Hooking up with Kid Tannen results in both of them mellowing out a ''lot''.]]
* KnightTemplar: Her views of justice are... ''Petty'', to say the least.
* MoralGuardians
* NotSoHarmlessVillain
* PyroManiac: [[spoiler:Burning down buildings is her go-to method of fighting against vice and corruption, and her Crazy!1931 incarnation shows that she absolutely ''revels'' in it.]]
* PuppyDogEyes: Young Edna lays this trope on Young Emmett, provoking a hilarious attempt at a [[TheUnsmile smile]].
* RedHerringShirt
* ShadowDictator: Citizen Edna.
* VillainousBSOD: [[spoiler:In the timeline where she inadvertently destroys Hill Valley and becomes [[TheHermit a hermit]] known as "Scary Mary".]]
* WellIntentionedExtremist: More Extreme than well-intentioned.
* [[WhyDidItHavetoBeSnakes Why Did It Have To Be Dogs?]]: [[spoiler: Not anymore in the ending]]

[[folder:Emmett Lathrop "First Citizen" Brown]]

An alternate Emmett Brown created by Marty's errors in the game. As different from the original Doc as you can get.

* AntiVillain
* AbsentMindedProfessor: Less than the original Doc Brown. Thanks to or because of Edna's influence on him.
* BigBrotherIsWatching: In Episode 3, "Big Brother" is Citizen Brown. [[spoiler:Though it's really Citizen Edna who pulls the strings.]]
* DecoyLeader
* FaceHeelTurn: See WhatTheHellHero below.
* HeroicBlueScreenOfDeath: See MyGodWhatHaveIDone.
* ManInWhite
* MyGodWhatHaveIDone: Once he realized his wife Edna used him and his science to try to turn Hill Valley citizens into mindless robots.
* ReasonableAuthorityFigure
* RefusalOfTheCall: Never became the scientist Doc Brown became. Instead ruling Hill Valley with an Iron Fist. [[spoiler: But it's Citizen Edna who pulls the strings]]
* ScienceIsBad: He blames his science for turning [[spoiler:Edna]] so corrupt in the future. He's wrong, of course, but he's unlikely to listen to reason...
* WellIntentionedExtremist
* WhatTheHellHero: Calls out Marty on this, because Marty fixing the timeline equals him and his life being erased from existence. He [[TakeAThirdOption takes a third option]].

[[folder:Irving "Kid" Tannen]]

Biff Tannen's father and a famous mob boss in 1931's Hill Valley. Owner of the Speakeasy that was blown the same year.

* DiscOneFinalBoss: He's kinda like the BigBad in episode 1 & 2, but his role is limited to cameos in the others episodes.
* JerkAss: He's a Tannen, what would you expect ?
* LoveRedeems: [[spoiler: See Edna's entry.]]
* {{Malaproper}}: "Make like a tree and die, rat!"
* OppositesAttract: [[spoiler: With Edna Strickland.]]

[[folder:Trixie Trotter/[[spoiler:Sylvia Miskin - [=McFly=]]]]]
Kid Tannen's singer and girlfriend. [[spoiler: As well as Marty's grandmother, George's mother and Arthur's wife]]

* TheChanteuse
* DumbBlonde: Though less than she initially seems, she's certainly no genius.
* HeelFaceTurn: Thanks to Marty who managed to trick Trixie into thinking Arthur was killed by Kid Tannen.
* GrandmaWhatMassiveHotnessYouHave:[[spoiler: She's Marty' grandma and she's blonde and skinny.]]
* GoodBadGirl: [[spoiler:We realize who she is in the end of episode 5...]]
* LukeIAmYourFather:[[spoiler: She's Marty' grandma.]]
* MysteriousPast: What [=CueBall=] knows about Trixie but never really tells.
* GlamorousWartimeSinger

[[folder:Arthur [=McFly=]]]

Marty's grandfather and George's father. Almost George's spitting image.

* {{Adorkable}}
* AllThereInTheManual: The novel says that Arthur went to UsefulNotes/WW1 but was discharged for fraudulent enlistment because he lied about his age before he got the chance to see combat. Arthur returned home without even firing a single shot and became a laughing stock. This event destroyed his self-confidence.
* ExtremeDoormat: Like George, his future son, but overall, his life is less miserable than George's was.
* HappilyMarried: [[spoiler:To Trixie Trotter.]]
* IdenticalGrandson: He looks exactly like George.
* SexyMentor: For Trixie